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I'm not sure if the answer is right, but here you go.y=mx+b 'm' is for gradient of the line. First, calculate the gradient.Let's use (6,15) and (8,21)Gradient, m = - -------------- - = 21 - 15 = 6 = 3 ----------- ---- 8 - 6 2 Therefore, m = 3 . Now let's search 'b' .Let's use (6,15) again. Substitute it into the equation.y=mx+b 15 = 3 (6) + bb = -3Thus, the equation : y=3x -3

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